Federal agents are ready to begin investigating a deadly explosion at a North Carolina food factory, but it may be a few days before they can safely enter the building.

The blast ripped off parts of the roof and many of the walls at the ConAgra Foods plant tuesday.

The explosion killed three workers and injured dozens more.

Christians in the community are working in shifts to minister to the survivors.

A southern Baptist men's group has been providing food and counseling.

"When we read them scripture and have prayer with them you can just see the presence of God come over them and bring them peace and right now that's what they need is peace and comfort," said volunteer Gene Schuyler.

The CEO of the plant has promised to help employees by paying them, even though the plant is closed.